Does nRF52840 SPIS configure GPIO pullup for CSN?

RE: Does nRF52840 SPIS configure GPIO pullup for CSN?

Jørgen Holmefjord — Thu, 23 Apr 2020 06:36:11 GMT

There is still a csn_pullup member in the config struct in the master branch. Your link was for the SPI master driver, not the slave driver.

RE: Does nRF52840 SPIS configure GPIO pullup for CSN?

machine — Wed, 22 Apr 2020 20:58:08 GMT

I was looking a Zephyr 2.2.0 "modules/hal/nordic" which seems to pull from master here:
https://github.com/NordicSemiconductor/nrfx/blob/master/drivers/include/nrfx_spi.h

RE: Does nRF52840 SPIS configure GPIO pullup for CSN?

Jørgen Holmefjord — Wed, 22 Apr 2020 13:39:28 GMT

Hi,

The pull config is set on the GPIO before the pin is set in the SPIS peripheral. The SPIS peripheral will control the pin once it is set in the peripheral, but this pull and drive-configs from the GPIO will still be effective.

[quote user=""]Previous versions of nrfx_spis.h:nrfx_spis_config_t had a "csn_pullup" field but the latest version does not.[/quote]

I'm not sure what you mean by this. I checked multiple versions of nrfx (1.6.2, 1.8.0, 2.0.0, 2.1.0) and they all have this member in the config struct.

Best regards,
Jørgen